PDP-11 with real ADV11-C board still unhappy

From: Tom Leffingwell <tom_at_sba.miami.edu>
Date: Wed Jan 16 23:36:18 2002

        I finally managed to obtain an ADV11-C without parting with a
large sum of money, but unfortunately, it didn't solve my problem. The
system still hangs at the same point it did when I used a DZ to "fake" the
ADV11 by setting its CSR to 770400. If I remove the ADV11, the program
runs, but it is forced into its simulate mode because the missing
hardware. I set the vector to the default on the DRV11, DRV11-B, and
ADV11-C. I didn't check the serial module though. Could this be a vector
setting problem, or do I have the wrong symptoms? Is there anything I can
learn by halting the system when its hung and looking at addresses in
memory?

        I did try doing a "770400/" and it returned 000000, with the
module out it gives a ?, so that seems good. 770402, the data buffer
returns 007777.

        Does anyone know what to try next? I'm running out of ideas.
The only difference between my system and the one I'm trying to replace is
that the backplane is 4 slot instead of 9, I don't have a BDV11-A like the
original had, and I have a DSD systems generic RX02, instead of the real
DEC M8029. Also, do the limit of backplane space, my modules are in a
slightly different order.

Thanks again,

Tom
Received on Wed Jan 16 2002 - 23:36:18 GMT